全文获取类型
收费全文 | 6113篇 |
免费 | 189篇 |
国内免费 | 9篇 |
专业分类
各国政治 | 273篇 |
工人农民 | 198篇 |
世界政治 | 370篇 |
外交国际关系 | 254篇 |
法律 | 3378篇 |
中国共产党 | 120篇 |
中国政治 | 245篇 |
政治理论 | 1065篇 |
综合类 | 408篇 |
出版年
2021年 | 43篇 |
2020年 | 96篇 |
2019年 | 73篇 |
2018年 | 96篇 |
2017年 | 132篇 |
2016年 | 113篇 |
2015年 | 129篇 |
2014年 | 120篇 |
2013年 | 542篇 |
2012年 | 201篇 |
2011年 | 230篇 |
2010年 | 232篇 |
2009年 | 228篇 |
2008年 | 256篇 |
2007年 | 273篇 |
2006年 | 260篇 |
2005年 | 242篇 |
2004年 | 175篇 |
2003年 | 149篇 |
2002年 | 152篇 |
2001年 | 216篇 |
2000年 | 184篇 |
1999年 | 135篇 |
1998年 | 73篇 |
1997年 | 55篇 |
1996年 | 46篇 |
1995年 | 58篇 |
1994年 | 51篇 |
1993年 | 48篇 |
1992年 | 93篇 |
1991年 | 90篇 |
1990年 | 106篇 |
1989年 | 88篇 |
1988年 | 85篇 |
1987年 | 83篇 |
1986年 | 104篇 |
1985年 | 110篇 |
1984年 | 76篇 |
1983年 | 79篇 |
1982年 | 50篇 |
1981年 | 47篇 |
1980年 | 44篇 |
1979年 | 48篇 |
1978年 | 55篇 |
1976年 | 35篇 |
1975年 | 46篇 |
1974年 | 61篇 |
1973年 | 55篇 |
1972年 | 42篇 |
1969年 | 41篇 |
排序方式: 共有6311条查询结果,搜索用时 15 毫秒
991.
Public Choice - To ameliorate ideological or partisan cleavages in councils and legislatures, we propose modifications of approval voting in order to elect multiple winners, who may be either... 相似文献
992.
Sierra F. Kaszubinski B.Sc. Jennifer L. Pechal Ph.D. Carl J. Schmidt M.D. Heather R. Jordan Ph.D. Mark E. Benbow Ph.D. Mariah H. Meek Ph.D. 《Journal of forensic sciences》2020,65(2):513-525
Microbial communities have potential evidential utility for forensic applications. However, bioinformatic analysis of high-throughput sequencing data varies widely among laboratories. These differences can potentially affect microbial community composition and downstream analyses. To illustrate the importance of standardizing methodology, we compared analyses of postmortem microbiome samples using several bioinformatic pipelines, varying minimum library size or minimum number of sequences per sample, and sample size. Using the same input sequence data, we found that three open-source bioinformatic pipelines, MG-RAST, mothur, and QIIME2, had significant differences in relative abundance, alpha-diversity, and beta-diversity, despite the same input data. Increasing minimum library size and sample size increased the number of low-abundant and infrequent taxa detected. Our results show that bioinformatic pipeline and parameter choice affect results in important ways. Given the growing potential application of forensic microbiology to the criminal justice system, continued research on standardizing computational methodology will be important for downstream applications. 相似文献
993.
994.
995.
996.
Elizabeth F. Drexler 《亚洲研究》2018,50(3):395-421
Analyzing photos and narratives of the “widows’ battalion” in Aceh, Indonesia that appeared in international and local print media between 2000 and 2002, this article traces how images of female combatants initially provided evidence of a uniformed, armed ethno-nationalist movement motivated by past state violence and linked to historical legends of women involved in armed resistance to colonialism. Subsequently, the heroines were recast as immoral young women pursuing inappropriate sexual relationships with the occupying military. The problems of intelligence gathering, double agents, and the indeterminate zone of overlap in which male soldiers collaborated in the past were rewritten as a problem of sexual or intimate relations that violated religious and cultural norms. In Aceh, the affective power and complexity of women’s positioning as both victim and combatant is fueled by the invocation of the iconic heroines of the anticolonial resistance and ideas about international human rights. Images and narration of the widows’ battalion appear to champion female combatants past and present, but in fact, contribute to the consolidation of the power of male commanders and combatants in the resistance movement. Analyses of human rights photography must consider the affective power of images beyond engaging the empathy of distant spectators to consider their role in conflict dynamics. 相似文献
997.
The I?can's phase method for the estimation of adult age at death from the sternal extremity of the fourth rib was introduced in 1983. Over the years, numerous tests have confirmed the reliability of this technique on varied samples. However, no large scale study has been conducted to test the application of this method on a modern white sample geographically, genetically, and culturally diverse from the American white database. Therefore, the purpose of this paper is to apply rib phase standards to a Turkish sample to test if the progression of morphological changes follow the same age sequence. Using a sample of 150 males and 144 females of known age at death, each rib was phased using the standards developed by I?can and associates in 1984 and 1985. The phase estimations were then subject to an analysis of variance. The results of the study indicated that Turkish ribs show the same morphological characteristics that define the phases at nearly identical ages. Variation as measured by the standard deviation increased from phase 5 on in both sexes. In conclusion, this study demonstrated that the rib phase standards can be accurately applied to Turks. Investigations of this nature are vital because one cannot assume that a method developed from one group is applicable to a distant population, especially in medicolegal proceedings. 相似文献
998.
"The authors analyze the Mexican household in the United States, emphasizing its complexity...as well as...its changes over time. The authors seek to understand the composition of relatives within exiled families, their life-cycle evolution, and the interaction of civil and migratory calendars. They also consider household changes related to the migratory process, changes in marriage and birth civil calendars, changes produced by work or marital events, and the type of migratory decisions developed within families." (EXCERPT) 相似文献
999.
1000.
V R Spiehler D Reed R H Cravey W P Wilcox R F Shaw S Holland 《Journal of forensic sciences》1975,20(4):647-655
The quantitative results (accuracy and precision) for determination of opiates by radioimmunoassay (RIA), enzyme immunoassay (EMIT), and spectrofluorometry on split samples are compared. A variety of physiological samples were studied, including random urine from a methadone maintenance clinic and postmortem urine, blood, bile, brain, and lung tissue from heroin-induced or heroin-related deaths. The opiate concentrations detected by the two immunoassay methods were in good agreement with each other in the absence of interfering substances which are believed to react with the antimorphine antibodies. The immunoassay results were in agreement within the relative standard deviation with the fluorometry results in 55% of the urine samples and 80% of the blood samples. The immunological methods are superior to fluorometry for quantitation of morphine in urine samples due to quenching interferences in fluorometry from urine. They were comparable to fluorometry for quantitation of morphine in blood samples. 相似文献